Journal
JOURNAL OF LUMINESCENCE
Volume 241, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2021.118487
Keywords
Topological materials; Terahertz radiation; ZrTe5; Photo-Dember; Optical rectification
Categories
Funding
- National Natural Science Foundation of China [11727812, 61927813, 12004056, 11904040]
- National Key Research and Development Program of China [2018YFB0504400]
- Fundamental Research Funds for the Central Universities, China [2020CDJQY-A056]
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The study investigates efficient terahertz emission from layered transition-metal pentatelluride ZrTe5 excited by femtosecond laser pulse, studying the physical mechanism and proving the absolute predominance of diffusion current, while achieving modulation of terahertz polarization. The findings indicate that ZrTe5 can generate strong and polarization controllable terahertz emission, crucial for investigating vibration modes of chiral biological molecules.
Intense, polarization controllable, and single-cycle terahertz pulses as light source are important tools to investigate physical and biological properties of materials. In this paper, we have detected efficient terahertz emission from layered transition-metal pentatelluride ZrTe5 excited by femtosecond laser pulse due to its strong anisotropy and high mobility of electrons. The physical mechanism of terahertz generation from this material is studied and the absolute predominance of diffusion current induced by photo-Dember effect is proved. In addition, we have achieved the modulation of terahertz polarization by adjusting the polarization states of the pump pulse. The generated elliptically polarized THz pulse is crucial for the investigation of vibration modes of chiral biological molecules, such as proteins and DNAs. Our findings indicate that strong and polarization controllable THz emission can be generated by ZrTe5.
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